It can be seen as obvious solution, but I searched it for years and found by revelation (afflatus).
The point is to attach modular (molle) belt to raid pack and disconnect it within minute – it is not an emergency dropping, but a change of pack configuration. For example, you arrive to the base camp, leave big pack there and go around with daypack and pouches on belt. Certainly, it’s not a combat solution (but it depends).
The bad approach is to dismount pouches from the one (left, to say) side of belt, tuck belt under the pack’s waist pad, then install pouches again. When disconnecting, dismount pouches, pull belt from under the waist pad, install pouches again.
The quick approach is:
– when connecting, pull inner belt from under the side sleeve and rear sleeve of outer belt;
– tuck inner belt under the pack’s waist pad;
– run inner belt into the side sleeve (bypassing the rear sleeve of outer belt)
– when disconnecting, pull inner belt from under the side sleeve and waist pad;
– run inner belt into the side sleeve and rear sleeve of outer belt.
No dismounting of pouches. Only requirement is to keep rear portion of sleeve free of pouches.
Here’s a grafical explanation: